Ocean acidification is one of the greatest environmental concerns linked to climate change. Ocean acidification is caused by the absorption of increasing atmospheric CO2. This increase in CO2 is due to the burning of fossil fuels. Not only does it affect humans, but it also affects many marine ecosystems. Coral reefs are one of the systems most affected by ocean acidification. Coral is one of the main ecosystem engineers in these ecosystems without them; the ecosystem will not be as healthy or sustainable for other organisms. Species richness and evenness will decrease significantly because of this. Corals help define the structure of the ecosystem so that fish can use it to protect themselves from predators. This structure allows many organisms to enter and settle there, due to the thriving biodiversity found in these ecosystems. This CO2-driven ocean acidification leads to a reduction in calcification and has a potential impact on calcifiers. Calcification is the process by which corals produce calcium carbonate. This decrease in calcium carbonate would result in loss of reefs as construction rates would fall below natural destruction rates. Echinoderms are vital in a marine environment and are present in almost all ecosystems. They are also essential ecosystem engineers. Adult echinoderms are more tolerant of ocean acidification than larvae. In this review, I will discuss how coral reefs are changing chemistry to cope with advancement. How algae abundance will increase due to this ocean acidification and could lead to better calcification conditions. What causes CO2 from this source and how exactly it enters the water, as well as how this leads to a reduction in calcium carbonate and the potential for calcifications and other organ... . middle of paper ......t for echinoderms but for other species that feed on them or on which they feed. Species richness will decrease with the diversity of this ecosystem. This will change the entire food web that coral reefs and other ecosystems use today. Some key predators may be too abundant or there may not be enough predators with a top-down and bottom-up effect on the trophic system. I believe that Kurihara's work and findings are the most important because they show the most direct impacts of ocean acidification on organisms and that this is a problem that needs to be addressed now before it does not worsen and completely destroy coral reefs and the marine ecosystem. The pH of seawater is expected to increase worldwide and many species will have little chance of avoiding these acidic conditions. These species will either have to adapt to this change or disappear due to extinction..